Poles ECNR Class RK5 250Vac, 1 to 60A Dual-Element, Time-Delay Fuses Dimensions (inches) Catalog Numbers (amps) Catalog Symbol: ECNR ECNR1 ECNR7 ECNR17.5 ECNR45 Dual-Element, Time-Delay 10 seconds (minimum) at 500% ECNR2 ECNR8 ECNR20 ECNR50 rated current (8 seconds for fuses 30A or less) ECNR3 ECNR9 ECNR25 ECNR60 Current-Limiting ECNR4 ECNR10 ECNR30 Volts: 250Vac (or less) ECNR5 ECNR12 ECNR35 125Vdc (or less) ECNR6 ECNR15 ECNR40 Amps: 1 to 60A IR: 200kA RMS Sym. Carton Quantity and Weight Agency Information: CE, UL Listed, Std. 248-12, Carton Weight per Carton Class RK-5, Guide JDDZ, File E162363, CSA Amps Quantity lbs kg Certified, C22.2 No. 248.12, Class 1422-02, 115 10 0.40 0.18 File 700489 17.530 10 0.50 0.23 Features 3560 10 1.00 0.45 Provides motor overload, ground fault and short-circuit Class RK5 Fuse Blocks (250V) Catalog Data protection. (Clip Retaining Spring Standard, Suffix R) Helps protect motors against burnout from overloads. Terminal Type (Suffix No.) 1 Basic Screw Box Lug 4 Helps protect motors against burnout from single- Catalog w/ Pres. w/ Clip Quick phasing on three-phase systems. Amps Number Plate CU only Connect 1 1 R25030-1 SR PR CR COR QR Simplifies and improves blackout prevention (selective to 2 R25030-2 SR PR CR COR coordination). 30 3 R25030-3 SR PR CR COR Dual-element fuses can be applied in circuits subject to 31 1 R25060-1 CR temporary motor overloads and surge currents to to 2 R25060-2 CR 60 3 R25060-3 CR provide both high performance short-circuit and overload protection. The overload element provides protection against low level overcurrent of overloads and will hold an overload which is five times greater than the amp rating of the fuse for a minimum of ten seconds. Form No. ECNR 1-60 0509 Page 1 of 2 BU-SB08624 Data Sheet 1315ECNR Class RK5 250Vac, 1 to 60A Dual-Element, Time-Delay Fuses Current Limitation Curves Time-Current Characteristic Curves Average Melt 8 30 60 10 15 Time-Current Characteristic Curves Average Melt Fuse Reducers For Class R Fuses Equipment Desired Fuse Catalog Number Fuse Clips (Case) Size (Pairs) 250V 60A 30A No. 263-R 100A 30A No. 213-R 60A No. 216-R 200A 60A No. 226-R The only controlled copy of this document is the electronic read-only version maintained by Cooper Bussmann. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. Form No. ECNR 1-60 0509 Page 2 of 2 BU-SB08624 Data Sheet 1315